This upgrade kit turns your Jflute into a proper flute when you feel ready to drop the original curved head. It contains a C-foot (Jflute lowest tone is low D).
There is not much to say about this kit, except that it works perfectly. The really cool thing about it is the new plastic tray that comes with it. You can put it in the case of your Jflute, making it possible to keep using it for carrying your upgraded "adult" flute :)
All in all : works very well, comes with a perfect tray for the Jflute case.